Ignition-plug for explosive-engines.



PATENTBD APR. 7, 1903.v

Y W. ROCHE. IGNITION PLUG FR EXPLOSIVE ENGINES.

APPLICATION FILED AUG. 16. 1902.

N0 MODEL.

v7 .lzsla nUNITED ,STATES PATENT OFFICE.

IVILLIAM ROCHE, OF JERSEY CITY, NEW JERSEY.

IGNITlON-PLUG FOR EXPLOSIVE-ENGINES.

SPECIFICATION forming part of Letters Patent No. 'l 24,945, dated April7, 1903.

Application led August 16, 1902. Serial No. 119,843. (No modali;

To a/ZZ whom it' may oon/cern:

Be it known that I, WILLIAM ROCHE, a citizen of the United States,residing at Jersey City, in the county of Hudson and lState of NewJersey, have invented certain new and useful Improvements inIgnition-Plugs forv Explosive-Engines, of which the following is aspecification.

This invention relates to ignition-.plugs for explosive-engines; and itsprimary object is to insure a regularand uniform action of the sparkingdevices by providing the same with complete and effective insulatingmeans.

A further object of the invention is to insure the direction of theelectric current to the sparking-point, thus avoiding premature orineffective sparking.

A further object of the invention is to provide a chamber adjacent tothe sparkingpoint for the reception and compression of spent gases,whereby fresh gas will at all times be presented at the point ofignition.

A further object of the invention is to provide a plug comprisingreadily adjustable and removable parts.

The construction of the improvement will be fully described hereinafterin connection with the accompanying drawings, which form part of thisspecification, and its novel and characteristic features will be definedand particularly pointed out in the appended claims.

In the drawings, Figure 1 is a side elevation of an ignition-plugembodying theinvention. Fig. 2 is a central Vertical section of thesame. Fig. 3 is a bottom plan View of the plug, and Fig. 4 is aperspective View of the sparking clip detached.

Corresponding parts in all the figures are denoted by the same referencecharacters.

The referencenumeral l designates the body or cylindrical casing oftheplug, formed with parallel longitudinal circular passages 2 and having adepending externally-threaded annular flange 3, forming a chamber 4 forspent gases. Within each of the circular passages 2 is supported aninsulating-tube 5, preferably of porcelain and of sufficient length toextend well above the upper end of the body of the plug and below thelower end of the threaded ange thereof. A cap 6,

' formed with openings for the passage 0f the insulating-tubes, isremovably secured to the top of the plug and insulated therefrom bywashers 7, preferably of asbestos. The conductor-rods 8 and 9 extendthrough the porcelain tubes 5, each of said rods havinga head 10 at itslower end and being threaded at its upper end to receive adjusting-nuts11 and clamping-nuts 12 for securing the wire conductors 13 and 14.

15 designates'a clip, preferably made of steel, bent transversely toform an ear 16, perforated to receive the headed conductorrod 8. Theclip 15 is also bent at its upper end to form a lip 17, havingits edgehollowed out to fit against the insulating-tube of the rod 9. A finger18 is struck up from the body ofthe clip and bent downward so that itspoint is in proximity to the head 10 of the conductor-rod 9. The clip 15is applied to one of the conductors, (in the present instance the rod8,) as best shown in Fig. 2, and when so applied the body portion of theclip extends between the insulating-tubes. The importance of thisposition of the clip is that in case the current should jump from theend of either of the rods to the body portion of the plug it would passto that portion of the clip extending between the insulatingtubes, andthus be conducted to the finger 18. The reason of this is that thedistance between the body of the plug and the lip 17 of the clip isalways less than that from any other two conductive portions-as, say,the head of one of the rods andthe flange 3. Hence the current willfollow the shortest road.

Each of the porcelain tubes is preferably formed with a collar 19, ttingwithin the upper portion of the passages 2, and insulatingpackings 20,of asbestos, are interposed between said collars and annular shoulders21, formed within the passages 2.

It will be seen that by the construction thus described theconductor-rods are each -ment of the parts or for any other cause thecurrent passes into the body of the plug it will be directed to thesparking-point through The parts of the device may be readily assembledand connected to the compressionchamber of an engine.

I Would have it understood that the invention is not restricted to allof the details of construction shown and described, but includes allsuch variations and modifications as may fall Within the terms and scopeof the following claims.

IIaving thus described lmy invention, I claim and desire to secure byLetters Patent l. An ignition-plug for explosive-engines, made up of abody fianged at one end so as to form a chamber for gases,independentlyinsulated conductor-rods extending through said body, and aclip device in contact with one rod and approaching the end of the otherto form a sparking-point and having a branch extending between theinsulated tubes of such rods Within the chamber, for the purpose setforth.

2. An ignition-plug for explosive-engines, comprising a body portionformed With parallel passages, and a depending iiange forming a chamberfor spent gases, insulating- .tubes within said passages, conductor-rodsWithin said tubes, and a clip in connection with one of said rods,having a finger approaching the other rod, and bent to form a branch toengage one of said insulating-tubes.

8. An ignition-plug for explosive-engines, comprising a body portionformed with parallel passages and having a projecting end iiange forminga gas-chamber, insulatingtubes Within said passages, conductor-rodsWithin said tubes, and a sparking clip provided With a perforated earfor attachment to one of said rods, a projected finger approaching theend of the other rod, and a lip adapted to bear against one of theinsulating-tubes, and partially embrace the same, substantially as andfor the purpose set forth.

In testimony whereof I have signed my name in the presence of thesubscribing Witnesses.

WILLIAM ROCHE.

Witnesses:

F. O. MGCLEARY, J. CLARK PYBAs.

